Floor sanding machine



Oct. 22, 1940. N, MM Q 2,218,703

FLOOR SANDING MACHINE Filed Nov. 29, 1938 3 Sheets-Sheet l ATTORNEYS 1940- A. N. EMMONS FLOOR SANDING MACHINE IS-Sheets-Sheet 2 Filed Nov. 29, 1938 INVENTOR.

II w ATTORNEYS,

Oct. 22, 1940. A. N. EMMONS 2,218,703

FLOO R SANDING MACHINE 'Fil ed Nov. 29, 1938 3 Sheets-Sheet s IN VENTOR.

ATTORNEYS.

I Patented Oct. 22, 1940 I v Q I UNITED STATES PATENT o m FLOOR SANDINGMACHINE Arthur N.- Emmons, Nedrow, N'. Y, assignor to The Porter-Cable Machine Company Inc., Syracuse,

N. Y., a. corporation of New York Application November 29, 1938, Serial No. 242,977

6 Claims. (01. 51-176) This invention relates to improvements in floor IS. The arms 18 depend from stems 19 which are sanding machines of the type disclosed in my slidably mounted in substantially vertically excopending application, Serial Number 104,496, tending apertures in the forward end of the filed October 7, 1936, which has become Patent frame, or, as here shown, in the ends of a bracket 6 No. 2,148,061. 2B which is detachably secured to the front or The'invention has as an object a particularly forwardend of the frame as by a screw 2I.- The simple and efficient construction for yieldingly upper ends of the stems I!) are threaded to re supporting the sanding drum on the frame and ceive adjusting. nuts 22, the purpose of which is which is conveniently operable to effect leveling to effect axial adjustment of the stems l9v and,

"10 of the drum to the surface being finished. arms I8 to level the drum 15, or to adjust the m The invention has as a further object a parsame so that it is parallel with the rollers l I. ticularly simple mechanism for adjusting the This adjustment is notmaterial in extent, but pressure of the sanding drum. on the floor, and only slight to compensate for any inaccuracies which mechanism is quickly and conveniently during, the manufacture and assembly of the adjusted. I machine. It is also desirable to have some yield- 15 The invention has as a further object means ing movement between the drum and the frame for detachably securing the motor to the frame, of the machine, particularly to -prevent any vibrae and by which the motor can be attached to the tion of the sanding drum from being transmitted frame ina particular convenient manner. to the entire machine. Heretofore, such vibra- The invention consists in the novel features tion was compensated for by spring mechanism 23, and in the combinations and constructions here: inserted between the arms I8'or stems l9' and the inafter set forth and claimed. bracket or frame of the machine. This spring In describing this invention, reference is had construction not only added -materiallyto the to the accompanying drawings in which like cost of the machine, but adversely affected the characters designate corresponding parts inall performance of the machine.. 1 25} the views. As here shown, a washer 24 of rubber com- Figure l is a side elevational view of a-machine position, or other yieldable material, is arranged embodying my invention with parts broken away on the lower portion of the stems l9 intermediate and parts in section. the arms l8 and the bottom of the bracket 2|].

,30 Figure 2 is a sectional view of the sanding drum The washer 24 is suificient y comp allow 3 with the supporting mechanism. therefor shown for axial adjustment of the stems 19' by nuts 22 partly in section and partly in elevation; .to effect leveling of the drum l5 and to absorb Figure 3 is a fragmentary detail sectional. view any undue vibration created by the drum l5 when of the mechanism for detachably' securing the in operation.

- 5 motor to the frame of the machine. The bearings I! are not mounteddirectly in Figure 4 is a fragmentary side elevational view the arms 18, but are arranged in a. yieldable of the motor casing. bearingmount consisting of inner and outer an- Figure 5 is a detail view of the mechanism for nular members 26, 21 between which is interposed adjusting the pressure of the sanding drum on an. annular ,member' 281 of rubber composition the floor. v I or material similar to that of which the washer 40 The machine here shownis similar in. general 24 is formed. The yielding member 28 is 'vul-- form and arrangement to the machine disclosed canized or permanently secured to the annular in my above-mentioned copending application, members 26, 21. This yieldable bearing mount Serial Number 104,496. also functions to absorb the vibration -of the -The machine consists of a chassis It provided drum l5, and further relieves the bearings I1 at its forward end with. a pair of'spaced: apart from any undue strain because of any slight rollers l l, and at its rear end with a swivel caster misalinement of the arms 18. l

I2. The rollers I I and caster I2 movably support 1 The rear portion of theichassis' i0 is formed the machine on the floor or surface being with anupward-ly extending projection 29 formed- 5o finished. with a s0cket into which the lower end ofa 5;

The machine further includes a frame: [3 pivhandle 30' is secured; The projection 29 is also otally' mounted to the chassis on atransversely formed with a rearwardly extending portion 3! extending axis it. The sanding drum i5 is which, :together with a web 3 2' formed. on, the mounted on a shaft I6 journalled in antifriction bracket 20,. serves as handles for conveniently bearings t1. mountectin the lower ends of. arms carrying the machine.v A-bracket 33, is secured 55 to one side of the projection 29, and a lever 34 is pivotally secured at one end to the bracket and extends transversely of the projection 29, see Figure 5. The opposite side of the projection is formed with a rack 35 provided with a plurality of teeth engageable by the lever 34 to maintain the same in adjusted position.

A tension spring 36 is connected at one end to the lever 34 intermediate its ends, and at the other end to the frame 13. The handle 30 is provided with lever mechanism for holding the rear end of the frame downwardly and the sanding drum out of engagement with the floor and operable to permit pivotal movement of the frame about the axis l4 to bring. the sanding drum into engagement with the floor. This pivotal movement is effected by the tension spring 36 and the pressure exerted by the drum on the floor depends upon the adjustment of the lever 34. The

lever mechanism for releasing the frame for" pivotal movement is shown in my Patent No. 1,974,136, issued September 18, 1934, the spring mechanism shown therein being omitted. It will be observed that the pressure on the sanding drum may be varied by moving the free end of the lever 34 into engagement with the proper tooth of rack 35.

A motor 45 is mounted upon the top side of the frame l3 and is operatively connected to the sanding drum l5 by belt 4|. A suction fan is arranged in the rear portion of the casing and is driven by the motor through belt 42. The motor is pivotally mounted at one side to the frame and is provided at the opposite side With .a screw 43 for adjusting the motor about its pivot toward and from the frame'to effect the proper tension on the belts 4 I, 42.

An important feature of this invention has to do with the means for detachably and pivotally mounting the motor on the frame. In the machine disclosed in my heretofore mentioned copending application, Serial Number 104,496, the frame was provided with spaced apart bosses having an aperture to receive a pivot pin which extended through the motor casing at the rear side thereof.

Floor finishing machines of the type herein referred to are of necessity moved from job to job, and in order that the machine may be conveniently handled it is necessary to remove the motor 40 which is of considerable weight. The pivot structure disclosed in my application referred to afforded a convenient means of remov ing and mounting the motor on the machine. However, some difliculty was experienced in alining the aperture in the motor casing with the apertures in the bosses on the frame in order to permit insertion of the pivot pin. With the construction hereinafter described, it is only necessary to set the motor on the frame and move the pivot pins inwardly, the construction embodying means for supporting the motor with the apertures in the motor casing arranged in alinement with the pivot pins.

As here shown, the frame 13 is provided adjacent the rear top portion thereof with upwardly extending spaced apart bosses 44 to receive the motor casing therebetween. Pivot pins 45 are mounted in the bosses 44 so as to have axial Accordingly, the outward axial movement of the pins 45 are limited, and the arrangement is such that when the pins are moved outwardly the inner ends of the pins project inwardly from the confronting sides of the bosses 44. The sides of the motor casing 40 are provided with inwardly extending apertures 48 to receive the inner ends of the pins 46, and the motor casing adjacent the apertures 48 is provided with an inverted crotch formation cooperable with the inwardly extending ends of the pins 45 to support the motor with the apertures 48 in register with the pins 4.5, .whereby the pins can be moved inwardly to pivotally secure the motor to the frame.

As here'shown, the motor casing is provided with inserts 50 secured to the motor casing as by screws 5l'. The inserts are formed with cylindrical portions 52 extending into the apertures 48, and the outer side of the inserts is of inverted U shape formation with the sides 53 diverging downwardly, see Figure 4, and with the apex or intermediate portion arranged in alinement with the upper side of the aperture formed in the insert. Accordingly, when the pins 45 are moved outwardly, the inner ends of the pins clear the cylindrical aperture in the inserts 50, and the motor is thensupported by the outer crotch or U formation of the insert. The motor can be then removed from the frame by simply lifting the motor off the frame. The motor is replaced on the frame by placing the crotch formation over the inner ends of the pins which, as before stated, project a slight distance inwardly from the confronting sides of the bosses 44, and it is then only necessary to push each of the pins 46 I" inwardly. If desired, the pins may be secured in the in position by tightening the screws 41.

The sides of the motor casing. adjacent the apertures 48 may be formed with the crotch structure integral with the casing. chassis, frame, motor casing, and similar parts of the machine, are preferably formed of aluminum and due to the inherent softness of this metal, the inserts 50 are formed of iron or steel. It will be apparent with this construction that the difficulty of alining the aperture in the casing of a heavy motor with the apertures in the bosses is eliminated.

What I claim is:

1. A sanding machine comprising a frame, a sanding drum journalled on the forward end of the frame, a motor carried by the frame for operating said drum, means for detachably securing the motor to the frame including a pair However, the

of pins carried by theframe and arranged in spaced apart relation to receive the casing of the motor therebetween and being movable axially toward and from each other, said motor casing being provided with inwardly extending apertures to receive the ends of said respective pins upon axial movement of the same, and said casing having means adjacent each aperture for guiding and centering said apertures with said pins.

2. A sanding machine comprising a frame, a sanding drum journalled on the forward end of the frame, a motor carried by the frame for operating said drum, means for detachably securing the motor to the frame including a pair of pins carried by the frame and arranged in spaced apart relation to receive the casing of the motor therebetween and being movable axially inwardly and outwardly from each other, means for limiting the outward movement of said pins, said motor casing being provided with inwardly extending apertures to receive the ends of said respective pins upon inward axial movement of the same, and said casing having means adjacent each aperture and cooperable with the ends of said pins when in out position for guiding and centering said aperture with said pins.

, 3. A sanding machine comprising a frame, a sanding drum journalled on the forward end of the frame, a motor carried by the frame for operating said drum, means for detachably securing the motor to the frame including a pair of pins carried by the frame and arranged in spaced apart relation to receive the casing of the motor therebetween and being movable axially inwardly and outwardly from each other, said casing being provided with inwardly extending aperturesto receive the ends of said respective pins upon inward axial movement of the same, and said casing having means adjacent each of said apertures for supporting the motor casingin spaced apart relation from the frame and alining said apertures with said'pins.

4. A sanding machine comprising a frame, a

sanding drum journalled on the forward end of the frame, a motor carried by the frame for operating said drum, means for. detachably sewith the inner ends of the same extending in-' curing the motor to the frame including a pair;

of bosses carried by the frame and arranged in spaced apart relation to receive the casing of the motor therebetween, a pin mounted in each of said bosses and being movable axially inwardly and outwardly from each other, said motor casing being provided with inwardly extending apertures to receive the ends of said respective pins upon inward axial movement of the same, means operable to limit outward movement of said pins wardly from the confronting sides of said bosses, said motor casing being provided witha crotch formation arranged to engage the inner ends of the respective pins when in out position and support the motor casing with the apertures therein arranged in alinement with said pins.

' lected one of said adjusted position,

5. A sanding machine comprising a chassis provided with rollers for movably supporting the same on the surface being finished, said chassis being provided with a projection extending upwardly from the rear end thereof, and a handle machine, a frame pivotally mounted intermediate its ends tosaid chassis, a sandingdrum journalled in the forwardnd of-the frame, a

motor carried by the frame and motion trans mitting means operatively connecting said motor and drum, a lever pivotallymounted at one end to' said projection and extending transversely of the frame, said projection being provided with a rack having a plurality of teeth, said lever being adjustable about its pivot and the intermediate portion of said lever engaging any seteeth to maintain the lever in I a tensionispring secured at one end to the lever intermediate its ends, and the opposite end being secured; to the rear portion -of said frame and being operable to urge said frame about its pivot to move the sanding drum into engagement with the surface being finished.

6. A sanding machine comprising a chassis provided with rollers fortmovably supporting the teeth to maintain the lever in adjusted position, I a tension spring secured at one end to said leverv and at the. opposite end to said sanding drum support and being operable to urge said support about its pivot to move'the sanding drum into engagement with the surface being finished.

ARTHUR- N. EMMONS.

, mounted in said projection for manipulating the r 

